Real name is Lyubomyr Kovacs.

Tinhead is a disgruntled combat veteran, specifically former military EOD, now working as a specialist in the private sector. Always wearing the heavy, sweaty bomb suit and a clunky blast helmet, he's the easily-agitated and cynical smartass who directly handles the explosives. It's the most dangerous job, and he reluctantly does it to pay off his debts.

For motivation with these particular lines:

1.) Pissed off, stated as if it were a real threat to someone.

2.) Said as a nonchalant reply, totally brushing off a massive threat to life that could have killed everyone in the team.

3.) Condescending and belittling another character's intelligence.